１．way后常用that代替in which，也可省略that。 I really don't like the way (that) he talks. That was the way in which the old lady looked after us.

２．of which起形容词的作用，相当于whose（用来指物）。 They live in a house whose door/the door of which opens to the south.

３．相同的先行词在表示不同的含义时，要根据其含义用不同的介词。 I can't remember the age at which he won the prize. That is the age in which people live in peace and happiness. age在前句中意为"年岁"，与at搭配，在后句中意为"时期"，与in搭配。

４．先行词或定语从句中的动词、形容词要根据不同的具体语境选择适当的介词。 This is the bus on which the accident happened. This is the bus by which I came to this town.

５．动词短语中的介词不可与动词分开提至关系代词前，常见的动词短词有：

listen to, look at, depend on, pay attention to, take care of, look into, break into, get rid of, take part in, make use of, take/catch hold of, catch up with, get along with, lood forward to等. 误：This is the girl of whom he will take care. 正：This is the gril whom he will take care of.